Janet first of all, if you are the original owner of your 15000 your machine is under warranty for 5 full years, that is why we should always register our machine on Janome America website. Your issues with your machine sounds like what I had and it was the bobbin assembly. I too was without my machine for 7 weeks.  The part was ordered from Japan and replaced by my dealer. No charged to me. My machine is 2 years old. Fortunately he gave me a loaner while I waited. 

Virginia. 

Sent from my Sprint Samsung Galaxy S10.

-------- Original message --------

From: Janet Gronski <jmgronski76@...>

Date: 6/22/20 7:13 AM (GMT-05:00)

To: onlinesewing-janome@groups.io

Subject: Re: [onlinesewing-janome] Troubles...

I had my 15000 for 11 months, and my machine started doing the same thing. I took it to my dealer 5 times over the course of 3 months! It would embroider fine for a short time, then the bobbin case jumped up, needles broke... My dealer ordered the tool you suggested Jim, filed down the burr, replaced the bobbin case at least 3 times, and it did it again and again. He ended up shipping it back to the Janome factory in New Jersey (I think it was). I was without my machine for 7 weeks.  I was very upset when I I receiving a big bill to have it fixed. I felt it should have been covered by the warranty. This sounds like a problem lots of folks are having. How can we all be blamed? Sounds like a design problem/flaw Janome needs to fix. These machines are too expensive to have these kinds of problems.  I'm beginning to think I made a big expensive mistake buying this machine. 

On Sun, Jun 21, 2020, 4:39 PM Jim Stutsman via groups.io <onlinesewing=icloud.com@groups.io> wrote:

BEFORE YOU TAKE IT IN - Remove the needle plate and bobbin holder. Use magnification and a bright light to closely inspect the rim of the silver "basket" that the bobbin case rides. In 25 years of servicing machines every time I was presented with a machine that "eats bobbin cases" there was damage to the hook race. Small pits usually just cause clicking while sewing, but nicks and deep gouges will cause the stitch to catch and not release properly. That will pull the case up and spin it, causing this kind of problem and usually more damage. Many dealers never look for this. There is a tool available to them (Part #OILSTONE) that will polish out minor damage, but if the hook race is notched or deeply damaged it should be replaced.

Another thing to check is the position of the bobbin case and stopper. Look at the area circled in this photo. The little "nub" on the bobbin case should be in full contact with the stopper. If the stopper is too far toward the front of the machine it is super easy for the case to pop up and spin, especially at high speed. Also note the position of the spring that the case bumps up agains. It should be absolutely straight as shown in the photo. If it is bent, or worse, missing, the stopper should be replaced.